+1 having a look at AutoImplementFor testing ranges, I usually use https://github.com/dlang/phobos/blob/master/std/internal/test/dummyrange.d
even though its internal ;-)
anyway, more and better testing always good.p.s. I think at some point we have to build some (the perfect) mocking framework with dependency injection and all the other awesome stuff. But before that can happen we have to lose the fear of classes and OO. Please no OT!
